[gearmesh, inc.]

If you ever get to having to do something with those valve springs, check into a camshaft company called Cam Motion @ http://www.cammotion.com/.

These guys make turbo specific cams and matching springs to go with them. I have seen a few turbo cars that have switched to their cams from the typical off the shelf N/A grinds and picked up significant power increases. The specs for their turbo cams look weird as compared to N/A cams. Intake durations are longer than the exhaust durations. Exhaust valve opening is delayed some so that on the exhaust stroke the piston actually starts heading up some before the exhaust valve opens. This gives more of a "kick" pulse to spool the turbo up quicker and harder. Lobe separation angles are even wider in order to eliminate overlap. Overlap with a turbo setup will result in reversion and dilution of your intake charge. Think of overlap with a turbo as EGR on steroids since the exhaust is pressurized up to the turbo.